On September 15, 2020, Cashman was placed on injured reserve after suffering a groin injury in Week 1.[6] He was activated on October 17.[7] On December 3, 2020, he was placed back on injured reserve after suffering a hamstring injury.[8][9]
On September 14, 2021, Cashman was placed on injured reserve.[10] He was activated on October 9, 2021.[11] He was placed back on injured reserve after suffering a groin injury in Week 7.[12]
Houston Texans
On March 18, 2022, Cashman was traded to the Houston Texans for a 2023 sixth-round pick.[13] On December 2, he signed a one-year contract extension.[14]
In Week 6 of the 2023 season, Cashman recorded 15 tackles, two for a loss, and two pass breakups in a 20-13 win over the New Orleans Saints, earning American Football Conference Defensive Player of the Week.[15] In Week 11 against the Arizona Cardinals, Cashman shifted to the Mike linebacker position with Denzel Perryman suspended and Henry To'oTo'o out with a concussion. He recorded a career–high 19 tackles (13 solo), including two quarterback hits in the 21–16 victory.[16]
Minnesota Vikings
On March 13, 2024, Cashman signed a three-year, $22.5 million contract with the Minnesota Vikings.[17]